Safety device for heaters.



I. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLIOATIOH FILED 1101 6, 1907.

mm Sept. 6, 1910.-

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I. FILSON.

SAFETY DEVIGE FOR HEATERS.

APPLIUATION IILEDNOY. 6, 190 7.

Patented Sept. 6, 1910.

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I. 'FILSON. SAFETY nsvms FOR HEATERS.

APPLICATION FILED NOV. 6, 1907.

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E5AFETY DEVICE FGR-i HEATLTJBii.

Bpecifloation of Letteiie i zttent.

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To all whom it may concern:

Be it known. that I, IRA FILSON, a citizen v of thel nited States, residing at Springfield. in the county of Clark and State of Ohio, have invented certain new and. ueeful Improvements in Safety Devices for Heab ers, of which the following is, specification, reference being had therein to the accompanying drawings.

This invention relates to safety devices for heaters, and more particularly for use in connection with that class of heaters which employ gas as a fuel. The pressure in the main supplying gas for this purpose, and particularly where natural gas is used, is subject to fluctuations, the pressure sometimes falling to such an extent as to ext-inguish the flame in the heater, and, at other times. increasing to such an extent to increase the flame and overheat the stove sufficiently to set fire to the building.

The object of this invention to overcome these difiiculties by providing a device which only be attached to the outlet or stove pipeior the heater and which will he actuated by the variations of the heat within the pipe to close an electric circuit, which cir cuit may he connected eitherto a suitable alarm or to an automatic cutoff for hutting off the supply ofgas; further, to provide such a dcvlce which will be positive and accurate in its action; which can be adjusted to close the circuit at difierent dc" greeg-of temperature; which will be compact and neat in appearance; end which may he immufactuired and installed at a low cost.

With these objects in view my invention cministn in certainnovcl features of con- 'w'LLlKfilHYl and iii-certain )artsi and combine.- tionulicrcinuitcr to be escribed, and then nmic particularly pointed out in the claims.

is a stove pipe equipped with my invention; lug. 2 is it 81013 elevation ot a portion of the pipe, showing the adjustable Contact fin gem; Fig. is a transverse sectional view,

taken on the line 02 a: of Fig. 1 and looking view of another modification of the invenin the accompanying; drawings. Figure 1 a. vertical 543051011, taken centrally through Appiicittlon filed November 8, 1367. Serial filo. wines.

tion; Fig. i in detail. view of the modified, form of iever cm oved in the device shown i i in i 1g. and l 8 is a fi'cctionat detail. view showing the support: for: the lever of Fig. "I.

in these drawings, i. have 1 at rated. one

embodiment of my invention Which, in its preferred foi'nn consists of a thermostat comprising two members. one ni which is adapted to expand to o greater extent than the other, and u levee cimnected with said thermostat in such it manner that it will he moved hy the unequai expansion oi: the

members of said, thermostat and aclupted.-

when so moved, to clone. an electric circuit which is adapted to cctonte at suitable aim? or (IUD'Ofl mechanism. [is shown in these draiviiigs 21 heat conducting Sttflh'as the stove-pipe i, compi' one of thcfinemborn of the thermostat, he other member 2 being secured preferably to the outer side thereof and spaced H0510 dietonce therefrom for the greater portion of .te length but having its upper end hent inwardly to n position close to the outer inn-fuse tn'jtiic pipe i. This member is eecured near its" lower end to the pipe 1 and has its unpet end free to move vertically of said pipe. The member 2 iii-(iv he of any suitable con-- structio-n, but preferuhiy consists of a bar of reiativcly smell vidth securei'ie i its lower end to the pipe 1, hutflnay, if desired, be constructtnl in the form of n. nlceva extending entirely mound the pipe 1, as shown in Fig". 4. upper; end with n veiticul slot 3, adapted to lap or extend over a portion of a similar slot 4 foiinc-ti in one side of the pipe 1 and adapted. to receivc the adjacent end of a lover or hnr 5, which extends through the slots 3 and 4 ton point beyond the some and has its other end 6 extending through a slot 7 in the opposite side of the pipe It and somewhut greater in length than the siot 1. A reinforcing plate 8 is prcferabl secured to the outer Wniiof the pipe 1 a jacent to the slot at and has formed therein a slot 9 of .iess length than the slot 4: and uda ted to register therewith, the edges of saii reinforcing plate extending beyond the edges of the slot 4 and engaging the edges of the lever 5 and holding the some out of engagement with the W215 of the slot 4. :The lever 5 is preferably provider with a notch or recess 1 0, formed in its upper edge ill) if desired, be formed of [5 1, will .expand, and, as that go btal center, formed by mounted upon the outer arm 14 adapted to receive the screw 20,

of which the arms are pivotally connected 55 to the arm of the member 15. Any suitable used to limit the inoveand adapted to engage with the upper wall v outer ends of the arms 13 I through a quarter of a revolution, as shown of the slot 3 in the member 2 to limit the longitudinal movement of said iever.

The two members of the thermostat may, different materiais having different coefiicients of expansion,

but this is notnecessary in the construction here showmas the pipe 1, which iorms one. member of the thermostat, is sub ected cum rectly to the heat passinq from the heater and expands more rapidly than does the member 2, which is removed some distance beyond the outer wail thereof and has but mited contact therewith. Thus, the pipe portion thereof containin the slot 4 moves upwardly, the lower wafi'of the slot 9 in the reinforcing member 8 will engage the lower edge of the member a and move the same about its pivt-he engagement of the upper edge thereof with the upper wall of the slot 3 in the member 2, thus causing the opposite end 5 of the lever to rise. The cooling cfthe pipe causes the same to con-- g tract and reverses the movement of the lever 5. v

A suitable circuit closing device is mounted on the outer wall of the pipe 1 near the slot '2' therein and is connected to one side of 30 a circuit 11, the opposite end or" which is connected to the pipe 1 by means of a suitable binding post' 12. This circuit closer preferably consists of one or more arms 13 of brass or other suitable material, pivotally of a substantially U -'shaped member 15, the other arm 16 of which is secured to a block of insulating'material 17 which, in turn, is secured to the ipe 1 by means of a suitable bolt 18, the-head of which is countersunk into the block of insulating material to such an extent that it is "out of contact with the arm 16 of the U-shaped member 15. arms 13, which are preferably two in numher, are curved andhave' their forward ends,

,which form the contact arms,adapted to extend on opposite sides of the outer end 6 of the lever 5 and their. Opposite ends extended andadapted toengage sui ble stops to to retain the contactfingers in their adjusted positions.

1 These arms also have apertured u'gs 19, formed intermediate their ends bymeans form of stopmay be ment of the arms about theirpivotal centers but I prefer that shown herein which consists ofa plate 21, of brass or other suitable material, secured to the insulating block 17 by means of a suitable screw 22 and, having its outer edges turned outwardly at substan of and provided The ceases which are twisted L 24, to bring the edges of the arms intt teeth 23. The outer ends 24 hi the arms 1.3

"are moved along the teeth 23 until the con ra-ct; arm 13 has been brought into the de sired relation to the outer end Got the lever 5, and in this position it is held by the en gagement of the outer ends of the 13 with the teeth 28, the resiliency of sand arms being suiiicient to retain the same in engagement with the teeth.

In that form of the device above described it is necessary to form apertures 0r slots 1n the walls of the pipe, which is objectionabie owing to the escape of the products of combastion through the same; In order to overcome this objectionable feature of the device 1 have devised a modified form of the same in which the lever extends about the out side or the ipe-instead ofthrough the same In the pre erred form of this 'rnodifieetion,

which is shown inFigs. 6 to 8 of the draw ings, the bar 2 extends longitudinally of'the pipe 1 in a manner sim lar to that shown in Fig. 1. This bar is rigldlysecured its lower end to the pipe by means of a bolt 27 and a spacing washer 28. This bar,- however instead ofv being bent inwardly at its upper end is preferably substantially straight throughout its length. and 1S provided at its upper end with suitable apertures or elongated slots 29 which are preferably two in number and are arranged near the opposite sides thereof and adapted to overlap andregister with a portion of slots or apertures 30 which are formed in a part carried by the ablyin the form of a plate pipe 1 which part is prefera '31 rigidly secured to the pipe 1 and having its upper portion bent outwardly to a position adjacent to the-upper end of the bar 2. This part may, however, be a portion of the wall of the pipe itself, as shown in Fig. i. The

bar 2 is preferably slidably connected to the plate 31, which connection may be formed in; any suitable manner, that preferred consisting in providing the plate '31'with an aperture 32 adapted to receive a tongue 33,

which is cut out'of theadjacent end of the,

bar '2, extended through said aperture and bent down against the side of the plate 31,

as shown in Fig. 8. The'lever iseonstructed to extend about the o'utsidcof the pipe from the support formed the plate 31 and barv 2 to a point adjacent tothe contact fingers 13 and preferably consists of a ring or band 34; of a diameter somewhat greater than the outer diameter oi 'the pipe 1, whereby it is adapted :toeXtend loosely aboutihat pipe.

This run. is hrovided on cne side with one-or moreprojections 34? adapted to engage the slots in the plate 31 and bar 2.

In the pres' eni; instance. these promotions are formed by' ELM munal Revs.

descrin thus E111" .2 (22mm 2 YUM 1 E pi the other eing an M mem' greater extent th 5 one ofsa and adapted .n he

ou er ends extending on opposite sides of said lever and their inner ends extended to form adjusting means, and a plate secured to said block, having its edges upturned and provided with teeth adapted to form stops and to be engaged hythe inner ends of said arms.

7. In a. device of the character described,

a pipe, a plate carried thereby, a bar extending longitudinally of said pipe at a distance therefrom, connected at one-end to said pipe and slidably connected at the other end to said plate, said plate and said bar having overlapping slots therein, alever extending through said slotsand adapted to be actuated by the movement of one of said members relatively to the other, and means controlled by the movement of said lever for actuating signal mechanism.

8. In a devicewf the character described, a pipe, a plate carried-therehy, a bar extending longitudinally of said pipe at a distance therefrom, connected at one end to said pipe, slidably connected at the other end to said plate and having an aperture therein near the end of said plate, a lever extending about said pipe having one end extending through the aperture in said ha-r engaged by said plate, and means controlled in. the lnoymnent of said letcr for actuating signal mfcehal ism.

, 9. In a device of the ch; actor described, a pipe, a plate carried thereby, a bar extending longitudinally of said pipe at. a distance therefrom,- connectedat one end.

to said pipe, slidably connected at the other end to said plate and having apertures theres in near the end of said plate, a lever ar rounding said tending througi the apertures in said liar and adapted to be engaged by the said plate, and means controlled by the movement of said lever for actuating signal mechanism. 10. In a device of the character described, a pipe, a plate carried by said pipe and having apertures therein, a fixed bar extend: ing longitudinally to said pipe and having apertures therein near the apertures in said plate, a lever extending loosely about said pipe, having its ends hent outwardly and extending through the apertures in said plate and said oar, said lever being pivotally supported by one of said members and adapted to be engaged by the other. of said members, and means controlled by the movement of said lever for closing a signal circuit. 11. In a device of the character described, a pipe, a liar extending longitudii'ially to said pipe, one of said members being; movable relatively to the other under the infinence of heat, a lever extending loosely about said pipe, pivotally mounted on one of said members and operatively connected to tilt: other of said members, whereby the movement of one of said inen'ihers relatively to the other will move said lever about its pivotal center, and a mechanism adapted to he controlled by the movement oi said lever.

'lll testimony whereof, l all'ix my signa' ture in presence of two witnesses.

IRA l llitlatiil.

\Vitnesscs FRANHN M. llama, Jr, llannnc'r L. lllnnuiinn.

ipe having projections ex- 

